Index Catalog // ScholarsArchive@OSU

Creator:: Angwin, Peter A.
Abstract:: Studies to identify the environmental factors that influence the rate of ectotrophic mycelial growth of Phellinus weirii (Murr.) Gilbertson along Douglas-fir roots were undertaken both in the laboratory and in the field. The effects of soil pH, nitrogen, moisture, temperature, microorganisms and bulk density were investigated. In the lab, the...
Resource Type:: Masters Thesis
Full Text:: Phellinus weirii (Murr.) Gilbertson in young-growth Douglas-fir AN ABSTRACT OF THE THESIS OF Peter Andrew

Creator:: Hessburg, Paul F.
Abstract:: Verticicladiella wageneri Kendr. is a vascular wilt pathogen of Douglas-fir in the Pacific Northwest, The disease is characterized by black staining of colonized sapwood; crown symptoms are those typical of a wilting syndrome. Histopathological studies revealed that the pathogen is limited to the xylem but causes vascular dysfunction in both...
Resource Type:: Dissertation
Full Text:: wageneri in Douglas-fir (Pseudotsuga menziesii) AN ABSTRACT OF THE THESIS OF Paul Francis Hessburg for

Creator:: Hoefnagels, Mariëlle Henriette, 1965-
Abstract:: Fusarium spp. are among the most important pathogens of Douglas-fir (Pseudotsuga menziesii) seedlings in bareroot nurseries. Currently the most effective disease control method is soil fumigation with methyl bromide. As methyl bromide is phased out, however, other disease management strategies may become more important. We explored two alternative approaches to...
Resource Type:: Dissertation
Full Text:: Biology and control of Fusarium spp. on Douglas-fir

Creator:: Cahill, James M.
Abstract:: A glaze storm of exceptional severity was seen in the Corvallis area, January, 1942. The weight of ice that accumulated in the crowns of young-growth Douglas-fir trees caused widespread top breakage in many stands lying in the broad path of this storm. Early research on this phenomenon showed the majority...
Resource Type:: Masters Thesis
Full Text:: top-broken, young-growth Douglas-fir trees ABSTRACT OF THE THESIS OF James Michael Cahill for the

Creator:: Winton, Loretta M.
Abstract:: A hierarchical series of studies, based mainly on molecular data, was conducted to elucidate the life history of the Douglas-fir Swiss needle cast pathogen Phaeocryptopus gaeumannii at macro- and micro-evolutionary scales. This information was then utilized to design and evaluate molecular diagnostic tools for use in studies on the epidemiology...
Resource Type:: Dissertation
Full Text:: : Phylogenetics, Population Genetics, Molecular Epidemiology, and Pathogenicity of the Douglas-fir Swiss Needle

Creator:: Rosso, Pablo H.
Abstract:: The main objective of this thesis was to determine the influence of tree vigor on susceptibility to Armillaria root disease. First, the effect of thinning, fertilizing and pruning on tree vigor of four young Douglas-fir (Pseudo tsuga menziesii var. menziesi,) plantations was explored. Tree vigor was calculated by measuring wood...
Resource Type:: Masters Thesis

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